muncie 4 speed input shaft bearing replacement

GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. MUNCIE 4-SPEED MANUAL TRANSMISSION ASSEMBLIES, GEARS & PARTS APPLICATIONS: GENERAL MOTORS 1963-1974 GENERAL MOTORS (HIGH PERFORMANCE) AUTO GEAR EQUIPMENT ... A6 Mainshaft Bearing/Shaft Snapring all 3831755 3831755 all 3831756 3831756 all 3831757 3831757 all 3831758 3831758 0.084" as req. The 1 inch or .75 inch steel pin you see right below the bearing retainer. Contrary to popular belief, you cannot tell a 4-speed Muncie is an M22 by looking at the input shaft splines. The 6308N Muncie rear mainshaft bearing is a direct replacement for all M20, M21, M22 4 speed transmissions as well as Autogear transmissions Tags: 6308n , muncie rear bearing Related Products (4) A GREAT HEAVY DUTY ROCKCRUSHER FOR YOUR CAMARO, NOVA, CHEVELLE, CORVETTE, GTO,442. However, GM made both 10- and 26-spline versions of the M20 and M21. Put pressure prying out and tapped the shaft inward with dead blow hammer. The typical gear lube leak in the front of the muncie usually comes from the cluster shaft bore. Trying to replace the input bearing on an M21. Muncie Brass & Bearing Kit ( Includes The Following Items) Gaskets, Front & Rear Bearings, (4)Syncro Rings, Shift Shaft Seals, Snap Rings, Roller Bearings, Slinger, Input Nut, Springs & Keys, Thrust Washers, Tailhousing Rear Oil Seal, Bushing & speedo seal: $125.00 Using the best components currently made for the Muncie today we are now able to supply replacement Muncie 4 speeds for a variety of applications. On the right is the small input shaft bearing, which is 1963 only. All M22s use a 26-spline shaft made from a stronger alloy than the other 4-speeds. The gasket around the bearing retainer could leak as well, and even the bolts around the retainer could leak since they thread through the cases front wall. The Muncie four-speed is as legendary as the cars that it was put into, with the M20, M21, and Rock Crusher M22 models all â¦ Removed the cover and nut and tried to pry outward on opposite sides of the snap ring. With the quality of used Muncie transmissions getting worse in the last 10 years, the idea of making new improved Muncie parts was becoming a reality. Outer race is loose from the case but tight on the shaft. Hello, So I need to replace the bearing in the tail shaft of my muncie m21 4 speed. The bearing is way too tight on the shaft. There are 2 basic ratios,close and wide. The Muncie transmission was an aluminum main case/extension housing, side-loaded transmission with a side-lever shift linkage. Maybe got a 16th or an inch or less. The Muncie 4 speed,was first designed in 1963,and lasted until 1974. 3831759 3831759 The 1963 transmission had a smaller front input shaft bearing and a specific front bearing retainer with a smaller outside diameter than the Muncie transmissions from 1964 and up. The close ratio gear box,gives you a fairly high first gear,with the rest of the gears fairly close together,for less rpm drop on your top end. It was time to give the Muncie four-speed a rebuild. 19/22 1971-'74 M22 2.20:1 ratio 26-spline 1-inch shaft - no groove - 32-spline output shaft STRONGEST Direct Replacement M22 With NEW Muncie AUTO GEAR SUPER CASE With The Strongest M22w WIDE RATIO or Close Ratio Gears for a 4 SPEED TRANSMISSION. Looking at the input shaft bearing, which is 1963 only is loose from case! I need to replace the bearing in the tail shaft of my Muncie M21 4.. On the shaft close and wide to pry outward on opposite sides the! 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